/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.web.reactive.function.client.support;

import java.util.List;
import java.util.Optional;
import java.util.OptionalLong;

import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

import org.springframework.core.ParameterizedTypeReference;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseCookie;
import org.springframework.http.ResponseEntity;
import org.springframework.http.client.reactive.ClientHttpResponse;
import org.springframework.util.Assert;
import org.springframework.util.MultiValueMap;
import org.springframework.web.reactive.function.BodyExtractor;
import org.springframework.web.reactive.function.client.ClientResponse;
import org.springframework.web.reactive.function.client.ExchangeStrategies;

/**
 * Implementation of the {@link ClientResponse} interface that can be subclassed
 * to adapt the request in a
 * {@link org.springframework.web.reactive.function.client.ExchangeFilterFunction exchange filter function}.
 * All methods default to calling through to the wrapped request.
 *
 * @author Arjen Poutsma
 * @since 5.0.5
 */
public class ClientResponseWrapper implements ClientResponse {

    private final ClientResponse delegate;


    /**
     * Create a new {@code ClientResponseWrapper} that wraps the given response.
     *
     * @param delegate the response to wrap
     */
    public ClientResponseWrapper(ClientResponse delegate) {
        Assert.notNull(delegate, "Delegate is required");
        this.delegate = delegate;
    }


    /**
     * Return the wrapped request.
     */
    public ClientResponse response() {
        return this.delegate;
    }

    @Override
    public ExchangeStrategies strategies() {
        return this.delegate.strategies();
    }

    @Override
    public HttpStatus statusCode() {
        return this.delegate.statusCode();
    }

    @Override
    public int rawStatusCode() {
        return this.delegate.rawStatusCode();
    }

    @Override
    public Headers headers() {
        return this.delegate.headers();
    }

    @Override
    public MultiValueMap<String, ResponseCookie> cookies() {
        return this.delegate.cookies();
    }

    @Override
    public <T> T body(BodyExtractor<T, ? super ClientHttpResponse> extractor) {
        return this.delegate.body(extractor);
    }

    @Override
    public <T> Mono<T> bodyToMono(Class<? extends T> elementClass) {
        return this.delegate.bodyToMono(elementClass);
    }

    @Override
    public <T> Mono<T> bodyToMono(ParameterizedTypeReference<T> typeReference) {
        return this.delegate.bodyToMono(typeReference);
    }

    @Override
    public <T> Flux<T> bodyToFlux(Class<? extends T> elementClass) {
        return this.delegate.bodyToFlux(elementClass);
    }

    @Override
    public <T> Flux<T> bodyToFlux(ParameterizedTypeReference<T> typeReference) {
        return this.delegate.bodyToFlux(typeReference);
    }

    @Override
    public <T> Mono<ResponseEntity<T>> toEntity(Class<T> bodyType) {
        return this.delegate.toEntity(bodyType);
    }

    @Override
    public <T> Mono<ResponseEntity<T>> toEntity(ParameterizedTypeReference<T> typeReference) {
        return this.delegate.toEntity(typeReference);
    }

    @Override
    public <T> Mono<ResponseEntity<List<T>>> toEntityList(Class<T> elementType) {
        return this.delegate.toEntityList(elementType);
    }

    @Override
    public <T> Mono<ResponseEntity<List<T>>> toEntityList(ParameterizedTypeReference<T> typeReference) {
        return this.delegate.toEntityList(typeReference);
    }

    /**
     * Implementation of the {@code Headers} interface that can be subclassed
     * to adapt the headers in a
     * {@link org.springframework.web.reactive.function.client.ExchangeFilterFunction exchange filter function}.
     * All methods default to calling through to the wrapped request.
     */
    public static class HeadersWrapper implements ClientResponse.Headers {

        private final Headers headers;


        /**
         * Create a new {@code HeadersWrapper} that wraps the given request.
         *
         * @param headers the headers to wrap
         */
        public HeadersWrapper(Headers headers) {
            this.headers = headers;
        }


        @Override
        public OptionalLong contentLength() {
            return this.headers.contentLength();
        }

        @Override
        public Optional<MediaType> contentType() {
            return this.headers.contentType();
        }

        @Override
        public List<String> header(String headerName) {
            return this.headers.header(headerName);
        }

        @Override
        public HttpHeaders asHttpHeaders() {
            return this.headers.asHttpHeaders();
        }
    }

}
